
13-10
ML63326 User's Manual
Chapter 13 Voice Synthesis
13.5 Voice Synthesis Section Clock Input Frequency
The clock used in the voice synthesis section is a high-speed clock supplied from the high-
speed clock generator circuit and is basically intended to have frequency of 2.048 MHz.
When selecting the crystal oscillation mode, since the signal frequency is internally halved
(1/2 frequency division), use a 4.096 MHz crystal.
When selecting the RC oscillation mode, since the oscillation waveform is used as it is, select
the value of R
OS
so that the frequency is in the range of 2 MHz to 1.8 MHz. However, in the
case of RC oscillation, care should be taken because the frequency of oscillations varies due
to changes in the voltage V
DDH
(2 times the value of V
DD2
) which is the power supply voltage
of the high-speed clock generator circuit.
Table 13-2 shows the relationship between the voice synthesis section input frequency and
the internal sampling frequencies.
Table 13-2 Relationship between the Voice Synthesis Section Input Clock
Frequency and the Internal Sampling Frequencies
When a different frequency signal is input, the sampling frequency changes in proportion to
that signal frequency. For example, when the input clock signal frequency is 1.024 MHz, the
sampling frequency will be half the sampling frequency given in Table 13-2.
Input frequency
Internal sampling frequencies
2.048 MHz
4.0 kHz, 5.3 kHz, 6.4 kHz, 8.0 kHz, 10.7 kHz, 12.8 kHz, 16.0 kHz
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